Datasheet

TPS61170
www.ti.com SLVS789C – NOVEMBER 2007– REVISED APRIL 2011
ELECTRICAL CHARACTERISTICS
VIN = 3.6 V, CTRL = VIN, T
A
= –40°C to 85°C, typical values are at T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
I
Input voltage range, VIN 3.0 18 V
I
Q
Operating quiescent current into VIN Device PWM switching no load 2.3 mA
I
SD
Shutdown current CRTL=GND, VIN = 4.2 V 1 μA
UVLO Under-voltage lockout threshold VIN falling 2.2 2.5 V
V
hys
Under-voltage lockout Hysteresis 70 mV
ENABLE AND REFERENCE CONTROL
V
(CTRLh)
CTRL logic high voltage VIN = 3 V to 18 V 1.2 V
V
(CTRL)
CTRL logic low voltage VIN = 3 V to 18 V 0.4 V
R
(CTRL)
CTRL pull down resistor 400 800 1600 kΩ
t
off
CTRL pulse width to shutdown CTRL high to low 2.5 ms
t
es_det
Easy Scale detection time
(1)
CTRL pin low 260 μs
t
es_delay
Easy Scale detection delay 100 μs
t
es_win
Easy Scale detection window time 1 ms
VOLTAGE AND CURRENT CONTROL
V
REF
Voltage feedback regulation voltage 1.204 1.229 1.254 V
Voltage feedback regulation voltage under
V
(REF_PWM)
V
FB
= 492 mV 477 492 507 mV
reprogram
I
FB
Voltage feedback input bias current V
FB
= 1.229 V 200 nA
f
S
Oscillator frequency 1.0 1.2 1.5 MHz
D
max
Maximum duty cycle V
FB
= 100 mV 90% 93%
t
min_on
Minimum on pulse width 40 ns
I
sink
Comp pin sink current 100 μA
I
source
Comp pin source current 100 μA
G
ea
Error amplifier transconductance 240 320 400 μmho
R
ea
Error amplifier output resistance 5 pF connected to COMP 6 MΩ
f
ea
Error amplifier crossover frequency 5 pF connected to COMP 500 kHz
POWER SWITCH
VIN = 3.6 V 0.3 0.6
R
DS(on)
N-channel MOSFET on-resistance Ω
VIN = 3.0 V 0.7
I
LN_NFET
N-channel leakage current V
SW
= 35 V, T
A
= 25°C 1 μA
OC and SS
I
LIM
N-Channel MOSFET current limit D = D
max
0.96 1.2 1.44 A
I
LIM_Start
Start up current limit D = D
max
0.7 A
t
Half_LIM
Time step for half current limit 5 ms
t
REF
Vref filter time constant 180 μs
t
step
V
REF
ramp up time 213 μs
(1) EasyScale communication is allowed immediately after the CTRL pin has been low for more than t
es_det
. To select EasyScale™ mode,
the CTRL pin must be low for more than t
es_det
the end of t
es_win
.
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